WO2022091594A1

WO2022091594A1 - Method for manufacturing segmented laminated core, and segmented laminated core

Info

Publication number: WO2022091594A1
Application number: PCT/JP2021/033052
Authority: WO
Inventors: 尚松永; 広一荒川; 大輔小宮
Original assignee: 株式会社三井ハイテック
Priority date: 2020-10-26
Filing date: 2021-09-08
Publication date: 2022-05-05
Also published as: JP2022069811A

Abstract

This method for manufacturing a segmented laminated core (1) comprises: advancing a punch (P2A) toward a die hole (D2a) provided in a die (D2A) and partially pressing a metal sheet (MS) into the die hole (D2a) with the punch (P2A) so as to perform cut-and-bend processing on a prescribed portion of the metal sheet (MS) along a prescribed cutting line, thereby forming a cut-and-bent piece (MSa) which includes a first end face and a base material part (MSb) which includes a second end face corresponding to the first end face; performing push-back processing on the cut-and-bent piece (MSa) with respect to the base material part (MSb), thereby temporarily connecting the cut-and-bent piece (MSa) and the base material part (MSb), with a cutting line therebetween which is constituted by the border between the first end face and the second end face; performing punching on the metal sheet (MS) so as to include said portion, thereby forming a plurality of ring-shaped metal sheet members; and laminating the plurality of metal sheet members to produce a laminated body. In a view from the direction of advancement of the punch (P2A), at least part of the outer shape of the punch (P2A) which corresponds to the cutting line is positioned outward of the outline of the die hole (D2a).

Description

Manufacturing method of split type laminated iron core and split type laminated iron core

The present disclosure relates to a method for manufacturing a split-type laminated core and a split-type laminated core.

In Patent Document 1, when a metal plate is cut and bent and pushed back, a plurality of cutting lines are punched out from the metal plate and a punched member provided in advance on the yoke material is punched out from the metal plate. Disclosed is a method for manufacturing a split-type stator laminated iron core, which comprises laminating a plurality of punched members to form a laminated body. The yoke material includes a plurality of yoke pieces, and the ends of adjacent yoke pieces are temporarily connected to each other via a cutting wire. Therefore, by applying an external force to the laminated body, the yoke material can be individualized into a plurality of yoke pieces along the cutting line.

Japanese Patent Application Laid-Open No. 2005-318763

The pushback process of Patent Document 1 includes pressing a portion of a metal plate that has been cut and bent by a stripper and a die in a pushback station. As a result, the cut and bent portion is completely pushed back to the original metal plate so as to be flush with the metal plate, and a cutting line in the punched member is formed. However, in this case, the holding force between the temporarily connected yoke pieces at the cutting line becomes strong, and a large force may be required to separate the yoke members into individual pieces.

Therefore, the present disclosure describes a split-type laminated iron core that can be separated into individual pieces with a smaller force and a method for manufacturing the same.

An example of a method for manufacturing a split-type laminated iron core is to advance a punch toward a die hole provided in a die and partially push the metal plate into the die hole with the punch to form a predetermined portion of the metal plate. Includes cutting and bending along a predetermined cutting line to form a cut and bent piece containing a first end face and a base metal portion containing a second end face corresponding to the first end face. May be good. An example of this method is to push back the cut and bent piece to the base material portion, and to form the cut and bent piece and the base metal portion through a cutting line formed by the boundary between the first end face and the second end face. May further include temporary connection. Examples of the method further include punching a metal plate so as to include a portion to form a plurality of metal plates exhibiting an annular shape, and laminating a plurality of metal plates to form a laminated body. May include. When viewed from the advance direction of the punch, at least a part of the outer shape of the punch corresponding to the cutting line may be located outside the contour of the die hole.

An example of the split type laminated iron core may be configured by laminating a plurality of metal plates exhibiting an annular shape. The metal plate material may include a first divided piece and a second divided piece arranged in the circumferential direction and divided by a predetermined cutting line. The first divided piece and the second divided piece may be temporarily connected via a cutting line composed of the first end face of the first divided piece and the second end face of the second divided piece. .. The first end face and the second end face may each include a region having a shear cross section in almost the entire area.

According to the method for manufacturing a split-type laminated iron core and the split-type laminated iron core according to the present disclosure, it is possible to separate the pieces with a smaller force.

FIG. 1 is a perspective view showing an example of a split type stator laminated iron core. FIG. 2 is an enlarged perspective view showing part II of FIG. 1. FIG. 3 is a top view showing a punched member constituting the stator laminated iron core of FIG. 1. FIG. 4 is an enlarged top view showing the IV portion of FIG. FIG. 5 is a sectional view taken along line VV of FIG. FIG. 6 is a perspective view schematically showing each end face of the cut and bent piece and the base material portion in FIG. FIG. 7 is an enlarged top view showing the VII portion of FIG. FIG. 8 is a sectional view taken along line VIII-VIII of FIG. FIG. 9 is a perspective view schematically showing each end face of the cut and bent piece and the base material portion in FIG. FIG. 10 is a schematic view showing an example of an apparatus for manufacturing a stator laminated iron core. FIG. 11 is a schematic cross-sectional view showing an example of a press working apparatus. FIG. 12 is a top view showing an example of a plurality of dies constituting the second punching unit. FIG. 13 is a top view showing an example of a die and a punch for cutting and bending by reverse clearance. FIG. 14 is a sectional view taken along line XIV-XIV of FIG. FIG. 15 is a top view showing an example of a die and a punch for cutting and bending with a positive clearance. FIG. 16 is a cross-sectional view taken along the line XVI-XVI of FIG. FIG. 17 is a cross-sectional view showing an example of the relationship between the incompletely pushed back portion of the metal plate and the die and stripper. FIG. 18 is a cross-sectional view showing an example of a processing unit forming a punching member, and is a diagram for explaining a state in which a metal plate material is punched out from a metal plate and stacked. FIG. 19 is a diagram for explaining how the stator laminated iron core is discharged from the press working apparatus in the machining unit of FIG. FIG. 20 is a diagram partially showing an example of a press working layout of a metal plate. FIG. 21 is a diagram showing a subsequent portion of FIG. 20 in the press working layout of the metal plate. FIG. 22 is a diagram showing a subsequent portion of FIG. 21 in the press working layout of the metal plate.

In the following description, the same code will be used for the same element or the element having the same function, and duplicate description will be omitted. In the present specification, the terms upper side, lower side, right side, and left side of the figure are referred to as the orientation of the reference numerals.

[Structure of stator laminated iron core]
First, the configuration of the stator laminated iron core 1 (split type laminated iron core) will be described with reference to FIGS. 1 to 9. The stator laminated iron core 1 is a part of the stator (stator). The stator is configured by attaching a winding (not shown) to the stator laminated iron core 1. A motor is configured by combining a stator and a rotor.

The stator laminated iron core 1 has a cylindrical shape. A through hole 1a that penetrates the stator laminated iron core 1 is provided in the central portion of the stator laminated iron core 1 so as to extend along the central axis Ax. The through hole 1a extends in the height direction (lamination direction) of the stator laminated iron core 1. A rotor can be arranged in the through hole 1a.

The stator laminated iron core 1 is a laminated body in which a plurality of punched members W (metal plate material, another metal plate material) are stacked. The stator laminated iron core 1 may be configured by laminating a plurality of punching members W. "Transposition" means stacking a plurality of punching members W while relatively shifting the angles of the punching members W. The rolling stacking is mainly carried out for the purpose of offsetting the plate thickness deviation of the punched member W and increasing the flatness, parallelism and squareness of the stator laminated iron core 1. The rolling angle may be set to any size.

The stator laminated iron core 1 includes a yoke 2, a plurality of teeth portions 3, and a plurality of caulking portions 4. The yoke 2 has an annular shape and extends so as to surround the central axis Ax. As illustrated in FIG. 1 and the like, the yoke 2 may have an annular shape. The plurality of teeth portions 3 extend along the radial direction of the yoke 2 from the inner edge of the yoke 2 toward the central axis Ax side. That is, the plurality of teeth portions 3 project from the inner edge of the yoke 2 toward the central axis Ax. The plurality of tooth portions 3 may be arranged at substantially equal intervals in the circumferential direction of the yoke 2. As illustrated in FIG. 1 and the like, the stator laminated iron core 1 may include 12 teeth portions 3. A slot 5, which is a space for arranging windings, is defined between the adjacent teeth portions 3.

The caulking portion 4 may be provided on the yoke 2, for example. Although not shown, the caulking portion 4 may be provided in each tooth portion 3, for example. The punching members W adjacent to each other in the stacking direction may be held by the caulking portion 4. The plurality of punched members W may be held by various known methods instead of the caulking portion 4. For example, the plurality of punched members W may be joined to each other by using, for example, an adhesive or a resin material, or may be joined to each other by welding. Alternatively, the stator laminated iron core is provided by providing a temporary caulking to the punching member W, holding a plurality of punching members W through the temporary caulking to obtain a laminated body, and then removing the temporary caulking from the laminated body. You may get 1. The "temporary caulking" means caulking that is used to temporarily integrate a plurality of punched members W and is removed in the process of manufacturing the product (stator laminated iron core 1).

Here, the punching member W will be described in more detail with reference to FIGS. 2 to 9. The punched member W is a plate-like body in which a metal plate MS (for example, an electromagnetic steel plate) described later is punched into a predetermined shape, and has a shape corresponding to the stator laminated iron core 1. As shown in FIG. 3, a through hole Wa is provided in the central portion of the punching member W. As shown in FIGS. 2 and 3, the punching member W has a yoke material W2 corresponding to the yoke 2 and a plurality of tooth pieces W3 corresponding to each tooth portion 3. A slot W5 corresponding to the slot 5 is defined between the adjacent tooth pieces W3.

The yoke material W2 is provided with a plurality of cutting lines CL1 and a plurality of cutting lines CL2 (another cutting line) so as to cross between the inner peripheral edge and the outer peripheral edge of the yoke material W2. The plurality of cutting lines CL1 and CL2 may be arranged alternately at substantially equal intervals in the circumferential direction of the yoke material W2.

As illustrated in FIGS. 1 and 3, the yoke material W2 may be provided with six cutting lines CL1 and CL2. In this case, the yoke material W2 is composed of 12 yoke pieces W2a (first divided piece, second divided piece). That is, the yoke material W2 may include a plurality of yoke pieces W2a divided by the cutting lines CL1 and CL2. The plurality of yoke pieces W2a may be arranged in the circumferential direction of the yoke material W2.

As will be described in detail later, the cutting lines CL1 and CL2 may be referred to as "incomplete pushback" in the present specification after the metal plate MS is cut and bent and the cut and bent portion is partially pushed back. ), And it is formed by temporarily connecting to the original position of the metal plate MS. That is, one adjacent yoke piece W2a and the other yoke pieces W2a are partially temporarily connected via the cutting lines CL1 and CL2. Therefore, as shown in FIG. 2, a step is formed between the ends of one adjacent yoke piece W2a and another yoke piece W2a. The size of the step may be about 10% to 40% of the plate thickness of the punched member W (metal plate MS). When the plate thickness of the punched member W (metal plate MS) is about 0.50 mm, the size of the step may be, for example, about 0.05 mm to 0.2 mm.
The term "cutting and bending" as used herein means cutting and bending. "Cut and bend portion" means a portion that has been cut and bent.

The cutting lines CL1 and CL2 may have an uneven shape as illustrated in FIGS. 2 to 4 and 7. Specifically, the edge CLa of one yoke piece W2a (upper side in FIG. 4, left side in FIG. 7) adjacent to each other in the circumferential direction of the yoke material W2 exhibits a concave shape (a shape in which the center is recessed in a rectangular shape). The edge of the other yoke piece W2a (lower side in FIG. 4, right side in FIG. 7) may have a convex shape (a shape in which the center protrudes in a rectangular shape).

As will be described in detail later, the cutting line CL1 is formed by cutting and bending with a reverse clearance. As illustrated in FIG. 4, the cutting line CL1 includes an end surface S1a (first end surface) of one yoke piece W2a (upper side in FIG. 4) adjacent to each other in the circumferential direction of the yoke material W2 and another yoke piece W2a ( It is composed of the boundary of the end face S1b (second end face) of (lower side of FIG. 4).
The "reverse clearance" means that the diameter of the punch to be cut and bent is larger than the diameter of the die hole.

As shown in FIG. 6, each of the end faces S1a and S1b is composed of a shear cross section SA. As shown in FIGS. 5 and 6, the end face S1a and the end face S1b are partially in contact with each other in the shear cross section SA. That is, the end face S1a and the end face S1b do not completely overlap each other.

As will be described in detail later, the cutting line CL2 is formed by cutting and bending with a positive clearance. As illustrated in FIG. 7, the cutting line CL2 is an end face S2a of one yoke piece W2a (left side in FIG. 4) and another yoke piece W2a (right side in FIG. 7) adjacent to each other in the circumferential direction of the yoke material W2. It is composed of the boundaries of the end faces S2b.
The "positive clearance" means that the diameter of the punch to be cut and bent is smaller than the diameter of the die hole. At this time, when the punch is inserted into the die, there is a gap between the outer wall surface of the punch and the inner wall surface of the die hole.

As shown in FIG. 9, the end faces S2a and S2b are composed of a shear cross section SA and a fracture surface SB, respectively. The shear section SA and the fracture surface SB are provided side by side in the plate thickness direction (vertical direction, stacking direction) of the yoke piece W2a. In one yoke piece W2a (left side of FIGS. 8 and 9), the shear section SA is located on the upper surface side, and the fracture surface SB is located on the lower surface side. In the other yoke pieces W2a (right side of FIGS. 8 and 9), the shear section SA is located on the lower surface side, and the fracture surface SB is located on the upper surface side.

As shown in FIGS. 8 and 9, the end face S2a and the end face S2b are partially in contact with each other in the shear cross section SA (see region R in FIGS. 8 and 9). That is, the end face S2a and the end face S2b do not completely overlap each other. On the other hand, in the end faces S2a and S2b, the shear section SA and the fracture surface SB are not in contact with each other.

Each tooth piece W3 extends along the radial direction of the yoke material W2 from the inner edge of the yoke material W2 toward the central axis Ax side. That is, each tooth piece W3 projects from the inner edge of the yoke material W2 toward the central axis Ax. One plate member W6 may be formed by integrally providing one tooth piece W3 on one yoke piece W2a. That is, the punching member W may be configured by temporarily connecting a plurality of plate members W6 in the circumferential direction of the yoke member W2 via the cutting lines CL1 and CL2.

Returning to FIG. 1, the stator laminated iron core 1 is formed by laminating a plurality of punching members W as described above. More specifically, the plurality of punching members W are laminated so that the yoke members W2, the tooth pieces W3, and the cutting lines CL1 and CL2 overlap each other in the stacking direction. Therefore, when a predetermined force is applied to the stator laminated core 1 to separate the stator laminated core 1 at the cutting lines CL1 and CL2, one stator laminated core 1 to a plurality of core pieces 6 (FIG. 1). In the example, 12 iron core pieces 6) are obtained. The iron core piece 6 is a laminated body in which a plurality of plate materials W6 are laminated. In other words, the stator laminated iron core 1 is configured by combining a plurality of iron core pieces 6.

One iron core piece 6 is composed of one yoke portion 2a and one tooth portion 3. The yoke portion 2a is a part of the yoke 2 when the yoke 2 is separated by the cutting lines CL1 and CL2. That is, the stator laminated iron core 1 is integrated by temporarily connecting the adjacent iron core pieces 6 in the circumferential direction of the central axis Ax at the end portions (cutting lines CL1 and CL2) of the yoke portion 2a.

When a plurality of cutting lines overlapping each other in the stacking direction are defined as a cutting line group G, the cutting line group G may be composed of only a plurality of cutting lines CL1. The cutting line group G may be composed of only a plurality of cutting lines CL2. The cutting line group G may be configured to include at least one cutting line CL1 and at least one cutting line CL2. When the cutting line group G includes the cutting lines CL1 and CL2, the cutting lines CL1 and CL2 may be arranged alternately in the stacking direction as illustrated in FIG. 2, and the cutting lines CL1 and CL2 are regularly arranged. Alternatively, they may be arranged irregularly.

[Manufacturing equipment for stator laminated iron core]
Subsequently, with reference to FIG. 10, the stator laminated iron core manufacturing apparatus 100 will be described. The manufacturing apparatus 100 is configured to manufacture the stator laminated iron core 1 from the strip-shaped metal plate MS. The manufacturing apparatus 100 includes an anchorer 110, a delivery apparatus 120, a press working apparatus 130, an annealing furnace 200, and a controller Ctr (control unit).

The uncoiler 110 is configured to rotatably hold the coil material 111. The coil material 111 is a metal plate MS wound in a coil shape (spiral shape). The delivery device 120 includes a pair of

rollers

121 and 122 that sandwich the metal plate MS from above and below. The pair of

rollers

121 and 122 are configured to rotate and stop based on an instruction signal from the controller Ctr, and intermittently and sequentially deliver the metal plate MS toward the press working apparatus 130.

The press working apparatus 130 is configured to operate based on an instruction signal from the controller Ctr. The press working device 130 may be configured to form, for example, a plurality of punching members W by sequentially cutting or bending or punching the metal plate MS sent out by the sending device 120 by a plurality of punches. .. The press working apparatus 130 may be configured to sequentially stack a plurality of punching members W obtained by punching to form a stator laminated iron core 1. The stator laminated iron core 1 formed by the press working apparatus 130 may be, for example, transported to the annealing furnace 200 by a conveyor Cv, or may be manually transported to the annealing furnace 200. The details of the press working apparatus 130 will be described later.

The annealing furnace 200 is configured to operate based on an instruction signal from the controller Ctr. The annealing furnace 200 is configured to heat the stator laminated iron core 1 conveyed from the press working apparatus 130 at a predetermined temperature (for example, about 750 ° C. to 800 ° C.) for a predetermined time (for example, about 1 hour). .. When the stator laminated iron core 1 is heated by the annealing furnace 200, the oil (stamping oil) adhering to the punching member W is evaporated and removed, and remains inside the punching member W. The distortion is removed.

The controller Ctr is, for example, a transmission device 120, a press working device 130, an annealing furnace 200, and a conveyor Cv based on a program recorded on a non-transient recording medium (not shown) or an operation input from an operator. Is configured to generate a signal to operate. The controller Ctr is configured to transmit the signal to the delivery device 120, the press working device 130, the annealing furnace 200, and the conveyor Cv, respectively.

[Details of press processing equipment]
Subsequently, the details of the press working apparatus 130 will be described with reference to FIGS. 11 to 19. As shown in FIG. 11, the press working apparatus 130 includes a lower die 140, an upper die 150, and a press machine 160. The lower mold 140 includes a base 141, a die holder 142, a die plate 143 (holding member), and a plurality of guide posts 144.

The base 141 is fixed on the floor, for example, and functions as a base for the entire press working apparatus 130. The die holder 142 is supported on the base 141. A plurality of discharge holes C1 to C5 are formed in the die holder 142. The discharge holes C1 to C5 may extend vertically inside the die holder 142. Materials punched from the metal plate MS (for example, punched member W, waste material, etc.) are discharged into the discharge holes C1 to C5.

The die plate 143 is configured to press the metal plate MS together with a plurality of punches P1 to P5. The die plate 143 includes a plurality of dies D1 to D5. The dies D1 to D5 are respectively arranged at positions corresponding to the punches P1 to P5, and include die holes D1a to D5a through which the corresponding punches P1 to P5 can be inserted. The dies D1 to D5 are arranged in this order from the upstream side to the downstream side in the transport direction of the metal plate MS.

The die D1 together with the punch P1 constitutes a first punching unit for punching the metal plate MS. The metal piece punched out from the metal plate MS by the first punching unit is discharged to the outside of the press working apparatus 130 through the discharge hole C1. The die D2, together with the punch P2, constitutes a second punching unit for cutting and bending the metal plate MS. The details of the second punching unit will be described later.

The die D3, together with the punch P3, constitutes a third punching unit for punching or half punching the metal plate MS. The metal piece punched out from the metal plate MS by the third punching unit is discharged to the outside of the press working apparatus 130 through the discharge hole C3. The die D4, together with the punch P4, constitutes a fourth punching unit for punching the metal plate MS. The metal piece punched out from the metal plate MS by the fourth punching unit is discharged to the outside of the press working apparatus 130 through the discharge hole C4.

The die D5, together with the punch P5, constitutes a fifth punching unit for punching the metal plate MS. The punching member W punched out from the metal plate MS by the first punching unit is discharged to the outside of the press working apparatus 130 through the discharge hole C5. The details of the fifth punching unit will be described later.

As shown in FIG. 11, the plurality of guide posts 144 extend linearly upward from the die holder 142. The plurality of guide posts 144, together with the guide bush 151a described later, are configured to guide the upper die 150 in the vertical direction. The plurality of guide posts 144 may be attached to the upper mold 150 so as to extend downward from the upper mold 150.

The upper die 150 includes a punch holder 151, a stripper 152 (holding member), a plurality of punches P1 to P5, and a pilot pin (not shown). The punch holder 151 is arranged above the die holder 142 and the die plate 143 so as to face each other. The punch holder 151 is configured to hold a plurality of punches P1 to P5 on the lower surface side thereof.

The punch holder 151 is provided with a plurality of guide bushes 151a. The plurality of guide bushes 151a are respectively positioned so as to correspond to the plurality of guide posts 144. The guide bush 151a has a cylindrical shape, and the guide post 144 can pass through the internal space of the guide bush 151a. When the guide post 144 is attached to the upper die 150, the guide bush 151a may be provided on the lower die 140.

The punch holder 151 is provided with a plurality of through holes 151b. A step-like step is formed on the inner peripheral surface of the through hole 151b. Therefore, the diameter of the lower part of the through hole 151b is set smaller than the diameter of the upper part of the through hole 151b.

The stripper 152 is configured to remove the metal plate MS that has bitten into the punches P1 to P5 from the punches P1 to P5 when the metal plate MS is pressed by the punches P1 to P5. The stripper 152 is arranged between the dies D1 to D5 and the punch holder 151.

The stripper 152 is connected to the punch holder 151 via the connecting member 153. The connecting member 153 includes a long main body portion and a head provided at the upper end of the main body portion. The main body of the connecting member 153 is inserted under the through hole 151b, and can move up and down in the through hole 151b. The lower end of the main body of the connecting member 153 is fixed to the stripper 152. Around the main body of the connecting member 153, an urging member 154 (for example, a compression coil spring or the like) configured to exert an urging force in a direction for separating the punch holder 151 and the stripper 152 is attached to them. May be.

The head of the connecting member 153 is arranged above the through hole 151b. The outer shape of the head of the connecting member 153 is set to be larger than the outer shape of the main body of the connecting member 153 when viewed from above. Therefore, the head of the connecting member 153 can move up and down in the upper part of the through hole 151b. However, since the step of the through hole 151b functions as a stopper, the head of the connecting member 153 cannot move to the lower part of the through hole 151b. Therefore, the stripper 152 is suspended and held by the punch holder 151 so that it can move up and down relatively with respect to the punch holder 151.

The stripper 152 is provided with through holes at positions corresponding to punches P1 to P5, respectively. Each through hole extends in the vertical direction. Each through hole communicates with the corresponding die holes D1a to D5a when viewed from above. The lower portions of the punches P1 to P5 are housed in each through hole. The lower portions of the punches P1 to P5 are each slidable in each through hole.

The press machine 160 is configured to move the upper die 150 up and down. The press machine 160 includes a crankshaft 161, a fixing member 162, a connecting member 163, and a drive mechanism 164. The crankshaft 161 includes a spindle (crank journal), an eccentric shaft (crank pin) located eccentrically from the spindle, and a connecting member (crank arm) connecting them.

The fixing member 162 is fixed to a fixed wall or the like, and is configured to rotatably hold the main shaft of the crankshaft 161. The connecting member 163 connects the crankshaft 161 and the punch holder 151. An eccentric shaft of the crankshaft 161 is rotatably connected to one end of the connecting member 163. A punch holder 151 is connected to the other end of the connecting member 163 via a rotating shaft (not shown).

The drive mechanism 164 is connected to the main shaft of the crankshaft 161 via, for example, a flywheel, a gearbox, or the like (not shown). The drive mechanism 164 operates based on the instruction signal from the controller Ctr to rotate the spindle of the crankshaft 161. When the spindle of the crankshaft 161 rotates, the eccentric axis makes a circular motion around the spindle. Along with this, the punch holder 151 reciprocates up and down between the top dead center and the bottom dead center.

Here, the configuration of the second punching unit described above will be described in more detail with reference to FIGS. 12 to 17. As shown in FIG. 12, the second punching unit includes a plurality of units U1 for performing cutting and bending with reverse clearance, and a plurality of units U2 for performing cutting and bending with forward clearance. The plurality of units U1 and the plurality of units U2 are arranged on the die plate 143 so as to exhibit a circular shape as a whole in the plan view shown in FIG. As illustrated in FIG. 12, the plurality of units U1 and the plurality of units U2 may be alternately arranged in the direction (circumferential direction) in which they are arranged.

The unit U1 includes a pushback plate Ua, an urging member Ub, a die D2A, and a punch P2A, as shown in FIGS. 13 and 14. The pushback plate Ua is arranged in the die hole D2a of the die D2A and is urged upward by the urging member Ub.

As shown in FIG. 13, the die hole D2a of the die D2A has a substantially rectangular shape when viewed from above, and is outward from one long side Ea (the long side on the left side of FIG. 13) of the central part. Includes protruding parts and protrusions. The shapes of the long side Ea and the contour Eb of the protruding portion correspond to the cutting line CL1.

When the direction in which the upper die 150 is located is defined as upward with respect to the lower die 140, the punch P2A is arranged above the die hole D2a of the die D2A so as to have a one-to-one correspondence with the die D2A. The view of the second punching unit in a plan view shown in FIG. 12 has the same meaning as the view of the second punching unit from above. The punch P2A has a shape corresponding to the die hole D2a of the die D2A when viewed from above. The punch P2A includes a central portion having a substantially rectangular shape when viewed from above, and a protruding portion protruding outward from one long side Qa (the long side on the left side of FIG. 13) of the central portion.

The one long side Qa of the punch P2A and the contour Qb of the protruding portion are located outside the one long side Ea of the die hole D2a of the die D2A and the contour Eb of the protruding portion. That is, in the plan view shown in FIG. 12, the portion constituting the long side Qa of one of the punches P2A and the contour Qb of the protruding portion is the long side Ea of one of the die holes D2a of the die D2A and the contour Eb of the protruding portion. It overlaps with the parts that make up. Therefore, as shown in FIG. 14, the reverse clearance H1 exists in the overlapping portion between the punch P2A and the die hole D2a of the die D2A. The size of the reverse clearance H1 may be, for example, about 1% to 2% of the plate thickness of the punched member W (metal plate MS). Alternatively, when the plate thickness of the punched member W (metal plate MS) is about 0.50 mm, the size of the reverse clearance H1 may be, for example, about 5 μm to 10 μm.

When the metal plate MS is cut and bent by the punch P2A and the die hole D2a of the die D2A, the cut and bent piece MSa and the base material portion MSb are formed as shown in FIG. The base metal portion MSb is the remaining portion that cannot be cut and bent. The cut and bent piece MSa is partially press-fitted into the base material portion MSb by the pushback plate Ua and the urging member Ub (incomplete pushback processing). A shear cross section SA is formed on most of the end faces of the cut and bent piece MSa and the base metal portion MSb.

The unit U2 includes a pushback plate Ua, an urging member Ub, a die D2B, and a punch P2B, as shown in FIGS. 15 and 16. The pushback plate Ua is arranged in the die hole D2a of the die D2B and is urged upward by the urging member Ub.

As shown in FIG. 15, the die hole D2a of the die D2B has the same shape as the die hole D2a of the die D2A. That is, the die hole D2a of the die D2B has a central portion having a substantially rectangular shape when viewed from above, and a protruding portion protruding outward from one long side Ec (long side on the left side in FIG. 15) of the central portion. including. The shape of the one long side Ec and the contour Ed of the protruding portion corresponds to the cutting line CL2.

The punch P2B is arranged above the die hole D2a of the die D2B so as to have a one-to-one correspondence with the die D2B. The punch P2B has a shape corresponding to the die hole D2a of the die D2B when viewed from above. The punch P2B includes a central portion having a substantially rectangular shape when viewed from above, and a protruding portion protruding outward from one long side Qc (the long side on the left side of FIG. 15) of the central portion.

The one long side Qc of the punch P2B and the contour Qd of the protruding portion are located inside the one long side Ec of the die hole D2a of the die D2A and the contour Ed of the protruding portion. Therefore, as shown in FIG. 16, a positive clearance H2 exists at a portion where the punch P2B and the die hole D2a of the die D2B are separated from each other. The size of the positive clearance H2 may be, for example, about 1% to 2% of the plate thickness of the punched member W (metal plate MS). Alternatively, when the plate thickness of the punched member W (metal plate MS) is about 0.50 mm, the size of the positive clearance H2 may be, for example, about 5 μm to 10 μm.

When the metal plate MS is cut and bent between the punch P2B and the die hole D2a of the die D2B, as shown in FIGS. 15 and 16, the cut and bent piece MSc (another cut and bent piece) and the base metal are formed. Part MSd is formed. The base material portion MSd is a portion of the metal plate MS corresponding to the cut and bent piece MSc, and is a portion that cannot be cut and bent. The cut and bent piece MSc is partially press-fitted into the base material portion MSd by the pushback plate Ua and the urging member Ub (incomplete pushback processing). A fracture surface SB and a shear section SA are formed on the end face of the cut and bent piece MSc in the order from top to bottom. Shear section SA and fracture surface SB are formed on the end face of the base metal portion MSd in the order from top to bottom.

Next, the configuration of the fifth punching unit described above will be described in more detail with reference to FIGS. 18 and 19. The die D5 is held on the die plate 143 so as to be rotatable around a central axis extending along the vertical direction. A rotary holder 171 for holding the die D5 may be provided on the die plate 143, and a drive mechanism 172 for rotationally driving the rotary holder 171 may be connected to the rotary holder 171.

The drive mechanism 172 rotates the die D5 around the central axis of the die D5 based on the instruction signal from the controller Ctr. Therefore, after the punching member W punched out from the metal plate MS is stacked on the punching member W punched out in advance, the die D5 rotates by a predetermined angle, so that the subsequent punching member W precedes. It is transposed with respect to the punching member W to be punched. The drive mechanism 172 may be composed of, for example, a combination of a rotary motor, gears, a timing belt, and the like.

A drive mechanism 173, a cylinder 174, and a pusher 175 are arranged in the discharge hole C5. The drive mechanism 173 is configured to drive the cylinder 174 in the vertical direction based on an instruction signal from the controller Ctr.

The cylinder 174 is configured to support the punched member W punched out from the metal plate MS by the punch P5. This prevents the punched member W from falling. The cylinder 174 may be driven by the drive mechanism 173 so as to intermittently move downward each time the punching member W is stacked on the cylinder 174, for example. When the punching members W are stacked up to a predetermined number on the cylinder 174 and the stator laminated iron core 1 is formed, the cylinder 174 is driven so that its surface is lowered to a position equal to the surface of the conveyor Cv. It may be driven by a mechanism 173 (see FIG. 19).

The pusher 175 is configured to push the stator laminated iron core 1 on the cylinder 174 to the conveyor Cv based on the instruction signal from the controller Ctr. The stator laminated iron core 1 delivered to the conveyor Cv is conveyed to the annealing furnace 200 and heat-treated.

By the way, as shown in FIG. 17, a plurality of openings V may be formed in the stripper 152. The opening V may be a through hole or a non-penetrating recess. By providing the opening V, the portion where the metal plate MS is incompletely pushed back in the second punching unit is not sandwiched by the die plate 143 and the stripper 152. This makes it possible to prevent the cut and bent pieces MSa and MSc from being completely press-fitted into the base metal portions MSb and MSd, respectively. When the metal plate MS is sandwiched between the die plate 143 and the stripper 152 in the second punching unit, a plurality of pieces so as to cover the partially press-fitted portion between the cut and bent piece MSa (MSc) and the base metal portion MSb (MSd). The opening V may be provided. When the metal plate MS is sandwiched by the die plate 143 and the stripper 152, the portion is located in the opening V. The plurality of openings V may be formed on the die plate 143, or may be formed on both the die plate 143 and the stripper 152.

[Manufacturing method of stator laminated iron core]
Subsequently, a method for manufacturing the stator laminated iron core 1 will be described with reference to FIGS. 20 to 22.

When the metal plate MS is intermittently sent to the press processing device 130 by the delivery device 120 and the predetermined portion of the metal plate MS reaches the first processing unit, the press machine 160 operates and the upper mold 150 is moved to the lower mold 140. Push down toward. Even after the stripper 152 reaches the metal plate MS and the metal plate MS is sandwiched between the stripper 152 and the die plate 143, the press machine 160 pushes the upper die 150 downward.

At this time, the stripper 152 does not move, but the punch holder 151 and the punches P1 to P5 continue to descend. Therefore, the tip portion of the punch P1 moves downward in each through hole of the stripper 152, and further reaches the vicinity of the die hole D1a of the die D1. In this process, the punch P1 punches the metal plate MS along the die hole D1a of the die D1. As a result, a plurality of through holes R1 and a plurality of through holes R2 are formed in the metal plate MS (see position X1 in FIG. 20).

The plurality of through holes R1 have a shape corresponding to the slot W5 of the punching member W, and are arranged radially as a whole. The plurality of through holes R2 have a rectangular shape and are arranged in a radial pattern. The through hole R2 is located radially outward of the through hole R1. The punched waste material is discharged from the discharge hole C1. After that, the press machine 160 operates to raise the upper die 150.

Next, when the metal plate MS is intermittently sent out by the delivery device 120 and the predetermined portion of the metal plate MS reaches the second processing unit, the upper mold 150 is moved up and down by the press machine 160 in the same manner as described above. Then, the metal plate MS is cut and bent and incompletely pushed back by the punch P2 and the die D2. As a result, cutting lines CL1 and CL2 are formed between the through hole R1 and the through hole R2 (see position X2 in FIG. 20).

Next, when the metal plate MS is intermittently sent out by the delivery device 120 and the predetermined portion of the metal plate MS reaches the third processing unit, the upper mold 150 is moved up and down by the press machine 160 in the same manner as described above. Then, the metal plate MS is punched or half punched by the punch P3 and the die D3. As a result, a plurality of caulked portions 4 are formed at predetermined positions of the metal plate MS (see position X3 in FIG. 21). The punched waste material is discharged from the discharge hole C3.

Next, when the metal plate MS is intermittently sent out by the delivery device 120 and the predetermined portion of the metal plate MS reaches the fourth processing unit, the upper mold 150 is moved up and down by the press machine 160 in the same manner as described above. , The metal plate MS is punched by the punch P4 and the die D4. As a result, a through hole R3 having a circular shape is formed (see position X4 in FIG. 21). The punched waste material is discharged from the discharge hole C4.

The through hole R3 has a shape corresponding to the through hole Wa of the punching member W, and partially overlaps the inside of the plurality of through holes R1. By communicating the through hole R3 with the through hole R1, a plurality of tooth pieces W3 are formed.

Next, when the metal plate MS is intermittently sent out by the delivery device 120 and the predetermined portion of the metal plate MS reaches the fifth processing unit, the upper mold 150 is moved up and down by the press machine 160 in the same manner as described above. Then, the metal plate MS is punched by the punch P5 and the die D5. As a result, the punching member W is formed (see position X5 in FIG. 22).

The punched member W is laminated in the die hole D5a with respect to the punched member W punched in advance, and is mutually held by the caulking portion 4. At this time, in order to carry out the rolling of the punching member W, the controller Ctr instructs the drive mechanism 172 before the punching process of the metal plate MS by the punch P5 is performed, and the punching member in the die hole D5a is instructed. The die D5 may be rotated by a predetermined angle together with W. When six cutting lines CL1 and six cutting lines CL2 are provided and the punching members W in which the cutting lines CL1 and CL2 are alternately arranged in the circumferential direction are rolled, the rolling angle is, for example, 30 °. It may be 60 °, 90 ° or 90 °. When the rolling angle is 30 ° or 90 °, the cutting lines CL1 and the cutting lines CL2 appear alternately in the stacking direction for any of the cutting line groups G of the stator laminated iron core 1. When the rolling angle is 60 °, either the cutting line CL1 or the cutting line CL2 appears in the single cutting line group G of the fixed laminated iron core 1 in the stacking direction.

When a predetermined number of punching members W are laminated in the die hole D5a, the stator laminated iron core 1 is formed (see FIG. 18). The stator laminated iron core 1 is pushed out to the conveyor Cv by the pusher 175 and conveyed to the annealing furnace 200. After that, when the stator laminated iron core 1 is heat-treated in the annealing furnace 200, strain is removed from the punching member W, and the stator laminated iron core 1 is completed.

[Action]
In the above method for manufacturing a split-type laminated iron core, a punch is advanced toward a die hole provided in the die, and the metal plate is partially pushed into the die hole with the punch to form a predetermined portion of the metal plate. Includes cutting and bending along a predetermined cutting line to form a cut and bent piece containing a first end face and a base metal portion containing a second end face corresponding to the first end face. May be good. An example of this method is to push back the cut and bent piece to the base material portion, and to form the cut and bent piece and the base metal portion through a cutting line formed by the boundary between the first end face and the second end face. May further include temporary connection. Examples of the method further include punching a metal plate so as to include a portion to form a plurality of metal plates exhibiting an annular shape, and laminating a plurality of metal plates to form a laminated body. May include. At least a part of the outer shape of the punch corresponding to the cutting line may be located outside the contour of the die hole when viewed from the advance direction of the punch. In this case, each of the punch and the die includes an overlapping portion where the punch and the die partially overlap each other when viewed from the advance direction of the punch. Therefore, when the bent piece and the base metal portion are formed by the cutting and bending process, the portion of the first end face and the second end face corresponding to the overlap portion becomes a substantially sheared cross section. Since the shear section is smoother than the fracture surface, the holding force between the first end face and the second end face corresponding to the overlapped portion tends to be small. Therefore, it is possible to individualize the metal plate material with a smaller force in the cutting line.

In the above method for manufacturing a split-type laminated iron core, another punch is advanced toward another die hole provided in another die, and the metal plate is partially used for another die hole with another punch. By pushing, a predetermined other part of the metal plate is cut and bent along a predetermined different cutting line to form another cutting piece including the third end face and a fourth corresponding to the third end face. It may further include forming another base metal portion including the end face of the. The above method further pushes back another piece of cut and bent against another base metal portion via another cutting line formed by the boundary between the third end face and the fourth end face. It may include temporarily connecting another cutting piece and another base material portion. In addition, the above method may include punching a metal plate to include another portion to form a plurality of different metal plate materials exhibiting an annular shape. When viewed from the advance direction of another punch, at least a part of the outer shape corresponding to another cutting line of another punch overlaps with the contour of another die hole or is located inward of another die hole. You may be doing it. Forming a laminate includes laminating at least one of a plurality of metal plates and at least one of a plurality of other metal plates such that a cutting line and another cutting line overlap. You may. In this case, a group of cutting lines in which a cutting line having a relatively small holding force and another cutting line having a relatively large holding force are arranged in a row in the stacking direction of the laminated body is formed in the laminated body. Therefore, by adjusting the number of metal plates constituting the laminated body and the number of other metal plates, the holding force in the cutting line group changes. Therefore, it is possible to adjust the force required to separate the laminated body into individual pieces in the cutting line group.

The above-mentioned method for manufacturing a split-type laminated iron core may further include annealing the laminated body after forming the laminated body. Annealing is a process for removing the strain remaining inside the metal plate material constituting the laminated body. Since the metal plate material thermally expands due to heating during annealing, the holding force between the first end face and the second end face temporarily connected via the cutting wire may increase. However, as described above, since the holding force of the first end face and the second end face corresponding to the overlapping portion is small, the metal plate material has a smaller force in the cutting line even after annealing. It becomes possible to individualize with.

In the above-mentioned method for manufacturing a split-type laminated iron core, forming a laminated body may include transposing a plurality of metal plates. In this case, by providing a plurality of types of cutting wires having different holding powers on one metal plate material and appropriately transposing the metal plate materials, the types of cutting wires overlapping in the stacking direction can be adjusted. Therefore, it is possible to control the force required to separate the laminated body into individual pieces in the cutting line group without increasing the types of metal plate materials.

The above-mentioned split type laminated iron core may be configured by laminating a plurality of metal plates exhibiting an annular shape. The metal plate material may include a first divided piece and a second divided piece arranged in the circumferential direction and divided by a predetermined cutting line. The first divided piece and the second divided piece may be temporarily connected via a cutting line composed of the first end face of the first divided piece and the second end face of the second divided piece. .. The first end face and the second end face may each include a region having a shear cross section in almost the entire area. In this case, it is possible to provide a split type laminated iron core capable of individualizing a metal plate material with a smaller force in a cutting wire.

[Modification example]
The disclosure herein should be considered exemplary and not restrictive in all respects. Various omissions, substitutions, changes, etc. may be made to the above examples within the scope of the claims and the gist thereof.

(1) In the above examples, one adjacent yoke piece W2a and another yoke piece W2a are partially temporarily connected via the cutting lines CL1 and CL2 by incomplete pushback processing. However, at any of the cutting lines CL1 and CL2, the adjacent yoke pieces W2a may be completely pushed back to each other. That is, in any of the cutting lines CL1 and CL2, there may not be a step between adjacent yoke pieces W2a. Alternatively, adjacent yoke pieces W2a may be completely pushed back to each other at any of the cutting lines CL1 and CL2. In this case, the number of openings V formed in the die plate 143 or the stripper 152 may be appropriately reduced.

(2) The end faces S1a and S1b may each include a region composed of a shear cross section SA and a fracture surface SB and a region substantially composed of a shear cross section SA. In this case, at least a part of the outer shape of the punch corresponding to the cutting line may be located outside the contour of the die hole.

(3) At least one cutting line may be formed by a die and a punch having a reverse clearance H1. All cutting lines may be formed by dies and punches with reverse clearance H1. In these cases, the reverse clearance H1 may be present in a part of the die and the punch, or the reverse clearance H1 may be present in the whole of the die and the punch.

(4) At least one cutting line may be formed by a die and a punch having a positive clearance H2.

(5) The plurality of cutting lines lined up in the stacking direction do not have to all overlap in the stacking direction.

(6) In the above examples, the cutting line has an uneven shape when viewed from above, but the cutting line extends along the radial direction of the yoke material W2 and in the circumferential direction of the yoke material W2. As long as it includes a line segment extending along the line segment, it may have another shape such as a crank shape or a step shape. Each line segment may have various shapes such as a straight line, a curved line, and an arc shape. For example, in FIG. 4, at least one corner may be cut out in a straight line (for example, a trapezoidal shape or the like), and at least one corner may be cut out in an arc shape (for example, an arc shape). You may be asked.

(7) In the above example, the inner rotor type stator laminated iron core 1 in which the rotor is arranged inside has been described, but the present technology also applies to the outer rotor type stator laminated iron core in which the rotor is arranged outside. May be applied.

(8) This technique may be applied not only to the stator laminated iron core 1 but also to the rotor laminated iron core.

[Other examples]
One adjacent yoke piece W2a and another yoke piece W2a form a cutting line CL1 so that the end faces S1a and S1b do not completely overlap each other and the end faces 12a and S1b partially abut against each other in the shear cross section SA. It is partially temporarily connected via. Further, one yoke piece W2a and another yoke piece W2a adjacent to each other are cut lines so that the end faces S2a and S2b do not completely overlap each other and the end faces S2a and S2b partially abut each other in the shear cross section SA. It is partially temporarily connected via CL2. In other words, a step is formed between one adjacent yoke piece W2a and another yoke piece W2a. In this case, as compared with the split type laminated iron core of Patent Document 1, the area in contact with the adjacent yoke pieces W2a in the shear cross section SA at the end faces S2a and S2b is smaller. As a result, the holding force between one adjacent yoke piece W2a and the other yoke pieces W2a becomes small. Therefore, the iron core pieces 6 can be separated into individual pieces with a smaller force.

The size of the step can be set to 10% to 40% of the plate thickness of the punching member W. In this case, the shape of the stator laminated iron core 1 tends to be maintained unless an external force for separating the iron core pieces 6 into individual pieces is positively applied to the stator laminated iron core 1. Therefore, while reducing the holding force between the iron core pieces 6, it is possible to prevent the iron core pieces 6 from being unintentionally separated into individual pieces.

The end faces S1a and S1b are substantially composed of a shear cross section SA. The fracture surface SB has relatively severe irregularities, whereas the shear section SA is relatively smooth, so that the holding force between the iron core pieces 6 on the end faces S1a and S1b is relatively small. Therefore, the iron core pieces 6 can be separated into individual pieces with a smaller force.

An opening V can be formed in at least one of the die plate 143 and the stripper 152. At the timing when the punch holder 151 reaches the bottom dead point (the timing when the metal plate MS is sandwiched by the die plate 143 and the stripper 152), the portion where the metal plate MS is incompletely pushed back is opened in the second punching unit. It may be arranged in the portion V. In this case, when processing the metal plate MS, a region of the metal plate MS excluding the vicinity of the portion is sandwiched between the die plate 143 and the stripper 152. Therefore, it is possible to form an incomplete press-fitting state of the cut and bent pieces MSa and MSc with respect to the base material portions MSb and MSd while suppressing the displacement of the metal plate MS during processing of the metal plate MS. As a result, it is possible to manufacture a split type laminated iron core 1 in which one yoke piece W2a adjacent to each other and another yoke piece W2a are temporarily temporarily connected to each other via the cutting lines CL1 and CL2.

The one long side Qa of the punch P2A and the contour Qb of the protruding portion may be located outside the one long side Ea of the die hole D2a of the die D2A and the contour Eb of the protruding portion. That is, the portion constituting the long side Qa of one of the punches P2A and the contour Qb of the protruding portion has the contour Eb of one of the long sides Ea and the protruding portion of the die hole D2a of the die D2A when viewed from above. It constitutes an overlapping part that overlaps with the constituent parts. Therefore, when the cut / bent piece MSa and the base material portion MSb are formed by the cutting / bending process, the portion of each end face of the cut / bent piece MSa and the base material portion MSb that corresponds to the overlapping portion becomes substantially a shear cross section SA. Since the shear section SA is smoother than the fracture surface SB, the holding force between the relevant portions tends to be smaller. Therefore, the punching member W can be individualized with a smaller force on the cutting line CL1.

A plurality of punching members W are laminated so that the cutting lines CL1 and CL2 overlap. In this case, the stator laminated iron core 1 is composed of a cutting line group G in which a cutting line CL1 having a relatively small holding force and a cutting line CL2 having a relatively large holding force are arranged in a row in the stacking direction. Therefore, by adjusting the number of overlapping cutting lines CL1 and CL2, the holding force in the cutting line group G changes. Therefore, it is possible to control the force required to separate the stator laminated iron core 1 in the cutting line group G.

After the plurality of punching members W are laminated to form the stator laminated iron core 1, the stator laminated iron core 1 can be heat-treated in the annealing furnace 200. Due to the thermal expansion of the punching member W during annealing, the holding force between the end faces of the adjacent yoke pieces W2a may increase. However, as described above, of the end faces of the cut and bent piece MSa and the base material portion MSb, the holding connection force of the portion corresponding to the incomplete pushback processed portion or the overlap portion is small, so that annealing is performed. Even after that, the punching member W can be individualized with a smaller force at the cutting line CL1.

A plurality of punched members W can be rolled up to form a stator laminated iron core 1. In this case, a plurality of types of cutting lines CL1 and CL2 having different holding powers are provided in one punching member W, and the punching members W are appropriately transposed so that the cutting lines CL1 and CL2 overlapping in the stacking direction are overlapped with each other. You can adjust the type. Therefore, it is possible to adjust the force required to separate the stator laminated iron core 1 in the cutting line group G without increasing the types of punching members W.

This disclosure appropriately incorporates the content disclosed in the Japanese patent application filed on October 26, 2020 (Japanese Patent Application No. 2020-178694).

1 ... Stator laminated iron core (split type laminated core, laminated body), 2 ... York, 100 ... Stator laminated iron core manufacturing equipment, 130 ... Press processing equipment, 143 ... Die plate (pinching member), 152 ... Stripper (pinching member) (Member), 200 ... Abrasive furnace, CL1 ... Cutting line (cutting line, another cutting line), CL2 ... Cutting line (another cutting line), Ctr ... Controller (control unit), D2 ... Die, D2a ... Die hole (member) Die hole, another die hole), D2A ... die, D2B ... die (another die), G ... cutting line group, MS ... metal plate, MSa ... cutting and bending piece, MSb ... base material part, MSc ... cutting and bending piece (Another cut and bent piece), P2A ... Punch, P2B ... Punch (another punch), S1a ... End face (first end face), S1b ... End face (second end face), SA ... Sheep cross section, SB ... Fracture cross section , U1, U2 ... Unit, V ... Opening, W ... Punching member (metal plate material, another metal plate material), W2 ... York material, W2a ... York piece (first divided piece, second divided piece).

Claims

By advancing the punch toward the die hole provided in the die and partially pushing the metal plate into the die hole with the punch, a predetermined portion of the metal plate is formed along a predetermined cutting line. By cutting and bending, a cut and bent piece including the first end face and a base metal portion including the second end face corresponding to the first end face are formed.
The cut and bent piece is pushed back to the base material portion, and the cut and bent piece and the base material portion are formed through the cutting line formed by the boundary between the first end face and the second end face. Temporarily connecting with
By punching out the metal plate so as to include the portion, a plurality of metal plate materials exhibiting an annular shape are formed.
Including laminating the plurality of metal plates to form a laminated body.
A method for manufacturing a split-type laminated iron core, wherein at least a part of the outer shape of the punch corresponding to the cutting line is located outside the contour of the die hole when viewed from the advance direction of the punch.
By advancing another punch toward another die hole provided in another die and partially pushing the metal plate into the other die hole with the other punch, the metal plate can be formed. A predetermined different part is cut and bent along a predetermined different cutting line, and another cut and bent piece including a third end face and another including a fourth end face corresponding to the third end face. Forming the base metal part and
The other cut and bent piece is pushed back to the other base material portion, and the other cutting line is formed by the boundary between the third end face and the fourth end face. Temporarily connecting the cut and bent piece to the other base material,
Further comprising punching the metal plate to include the other portion to form a plurality of different metal plate materials exhibiting an annular shape.
Whether at least a part of the outer shape of the other punch corresponding to the other cutting line overlaps with the contour of the other die hole or is more than the other die hole when viewed from the advance direction of the other punch. Is also located inward,
To form the laminated body, at least one of the plurality of metal plates and at least one of the plurality of other metal plates are laminated so that the cutting line and the other cutting lines overlap each other. The method of claim 1, wherein the method comprises:
The method according to claim 1 or 2, further comprising annealing the laminate after forming the laminate.
The method according to any one of claims 1 to 3, wherein forming the laminated body includes laminating the plurality of metal plates.
It is a split-type laminated iron core composed of a plurality of annular metal plates laminated together.
The metal plate includes a first division piece and a second division piece arranged in the circumferential direction and divided by a predetermined cutting line.
The first divided piece and the second divided piece are temporarily connected via the cutting line composed of the first end surface of the first divided piece and the second end surface of the second divided piece. Has been
The first end face and the second end face are each a split type laminated iron core including a region having a shear cross section in almost the entire area.